Help me to help - GitHub

Please help me to help the community.
I am currently try get a better understanding of using the icons.
I noticed that the documentation could be revised
So I tried to find the source for the Icon page in GitHub.
Unfortunately without success.

Where in GitHub can I see se source of it?

Where in GitHub can I find the icons itself?

Thank you for your help.

I don’t know the answer to the second question though. I think they are pulled over from the Eclipse Smarthome repo.